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本文对各种防火墙技术进行了分析,重点讨论了状态检测技术的原理和包过滤机制中的实现。并结合Windows系统的封包技术,给出了基于NDIS中间驱动层的具有状态检测功能的主机防火墙的具体实现方案。
This paper analyzes various firewall technologies, focusing on the principle of stateful detection techniques and the realization of packet filtering mechanism. Combined with the encapsulation technology of Windows system, this paper presents the concrete realization plan of the host firewall with status detection based on NDIS intermediate driver layer.